LOCAL ANESTHESIA PROMETRIC EXAM QUESTIONS WITH 100% CORRECT ANSWERS
| VERIFIED | UPDATED (ACTUAL EXAM)
Question 1
A patient requires treatment for a periodontal abscess on the lingual aspect of tooth #15. You
have already administered a Posterior Superior Alveolar (PSA) nerve block. Which additional
injection is required to anesthetize the lingual tissues?
A) Nasopalatine nerve block
B) Greater Palatine nerve block
C) Lesser Palatine nerve block
D) Middle Superior Alveolar nerve block
E) Local infiltration at the mucobuccal fold
Correct Answer: B) Greater Palatine
Rationale: The PSA nerve block anesthetizes the buccal periodontium and pulps of the
maxillary molars (except the mesiobuccal root of the 1st molar). To anesthetize the
palatal/lingual gingiva of the maxillary molars, the Greater Palatine nerve block is
necessary as it covers the hard palate and overlying soft tissues from the third molar to the
first premolar.
Question 2
You are performing subgingival scaling on the lingual surface of tooth #13. If you choose to use
a local infiltration for anesthesia, where should the needle be inserted?
A) At the mucobuccal fold
B) At the mucogingival junction
C) Into the free gingival margin
D) At the apex of tooth #13
E) Into the incisive papilla
Correct Answer: C) Free gingival margin
Rationale: For palatal infiltrations intended to provide localized anesthesia for scaling and
root planing (SRP), the injection is typically given in the attached gingiva or near the free
gingival margin of the specific tooth to affect the local nerve endings in that area.
Question 3
A patient presents with a deep periodontal defect on the lingual root surface of a maxillary
central incisor. Which injection is most appropriate to provide lingual anesthesia for this area?
A) Greater Palatine nerve block
B) Infraorbital nerve block
C) Nasopalatine nerve block
D) Mental nerve block
E) Long Buccal nerve block
Correct Answer: C) Nasopalatine
Rationale: The Nasopalatine nerve block provides anesthesia to the anterior portion of the
hard palate (soft and hard tissues) from the mesial of the right first premolar to the mesial
of the left first premolar.
, 2
Question 4
A patient develops a hematoma immediately following a Posterior Superior Alveolar (PSA)
nerve block. What is the recommended immediate treatment?
A) Heat packs for 24 hours
B) Cold packs and compression for 12 hours
C) Antibiotic prophylaxis
D) Incision and drainage
E) Immediate referral to an oral surgeon
Correct Answer: B) Cold and compression for 12 hours
Rationale: Immediate treatment for a hematoma involves applying pressure to the site of
bleeding and cold packs to promote vasoconstriction and minimize swelling. Heat should
only be applied after 24 hours to help dissipate the blood.
Question 5
A patient with a history of Cirrhosis of the liver requires Scaling and Root Planing (SRP). What
is the primary concern when administering an amide local anesthetic?
A) The patient is more likely to have a sulfa allergy
B) The drug will be excreted too quickly by the kidneys
C) The patient may have complications metabolizing the drug, increasing toxicity risk
D) Amides will cause a drop in blood pressure
E) There are no contraindications for amides in liver disease
Correct Answer: C) Patient has complications metabolizing the drug
Rationale: Amide local anesthetics (like Lidocaine and Mepivacaine) are primarily
metabolized in the liver. In a patient with Cirrhosis, hepatic function is compromised,
which can lead to a slower rate of metabolism, higher systemic blood levels of the
anesthetic, and an increased risk of toxicity.
Question 6
Which of the following statements best describes the ideal characteristics of a topical anesthetic?
A) It must be absorbed systemically to work
B) It works on keratinized tissue and is systemically toxic
C) It works on mucous membranes and is not systemically toxic
D) it must be injected into the basement membrane
E) It has a higher pH than the surrounding tissue
Correct Answer: C) #1. Works on mucous membranes. #2 not systemically toxic
Rationale: Topical anesthetics are designed to provide surface anesthesia to non-keratinized
mucous membranes. They should ideally have low systemic absorption to avoid toxicity
while effectively numbing the free nerve endings.
Question 7
In which of the following areas would a topical anesthetic be LEAST effective?
, 3
A) Buccal mucosa
B) Sublingual tissue
C) Keratinized/palatal tissue
D) Alveolar mucosa
E) Vestibular tissue
Correct Answer: C) Keratinized/palatal tissue
Rationale: Topical anesthetics do not penetrate highly keratinized tissue well. The hard
palate and attached gingiva are heavily keratinized, making the absorption of topical
agents significantly slower and less effective than on loose mucosa.
Question 8
What determines the "shelf-life" of a local anesthetic solution?
A) The date the box was opened
B) The color of the rubber stopper
C) The expiration date printed on the cartridge
D) The temperature of the room
E) The concentration of the vasoconstrictor
Correct Answer: C) Expiration date on cartridge
Rationale: The manufacturer guarantees the potency and sterility of the solution until the
expiration date listed on the glass carpule, provided it has been stored correctly.
Question 9
What is the clinical expectation if 1 mL of local anesthetic solution is administered over the
course of one minute?
A) The patient will experience a toxic reaction
B) No problems; this is a safe and slow rate of delivery
C) The patient will experience significant discomfort
D) The needle is likely to break
E) The heart rate will double
Correct Answer: A) No problems
Rationale: The recommended safe rate of deposition for local anesthesia is approximately 1
mL per minute. Rapid injection (e.g., a full cartridge in 30 seconds) increases the risk of
pain and systemic toxicity.
Question 10
Why does local anesthesia often fail to provide adequate numbing when injected into an area of
active infection or an abscess?
A) The bacteria eat the anesthetic molecules
B) The increased blood flow washes the drug away instantly
C) The infected area is more acidic (lower pH), which prevents the drug from ionizing into its
lipid-soluble form
, 4
D) The patient’s nerves are dead in infected areas
E) Vasoconstrictors do not work in the presence of pus
Correct Answer: C) The infected area is more acidic which does not allow ionization of
sodium molecules
Rationale: Local anesthetics are weak bases. In the low pH (acidic) environment of an
infection, the equilibrium shifts, and fewer molecules are available in the uncharged, lipid-
soluble form needed to cross the nerve membrane and block sodium channels.
Question 11
What is the maximum recommended dose of epinephrine for a healthy adult patient and a patient
with significant cardiovascular disease?
A) 0.5 mg (Healthy) / 0.1 mg (Cardiac)
B) 0.2 mg (Healthy) / 0.04 mg (Cardiac)
C) 1.0 mg (Healthy) / 0.5 mg (Cardiac)
D) 0.04 mg (Healthy) / 0.2 mg (Cardiac)
E) 0.01 mg (Healthy) / 0.00 mg (Cardiac)
Correct Answer: B) 0.2 mm for healthy / 0.04 mm for cardiac pt
Rationale: Healthy patients can tolerate up to 0.2 mg of epinephrine (approx. 11 cartridges
of 1:100k). Cardiac patients are limited to the "cardiac dose" of 0.04 mg (approx. 2
cartridges of 1:100k) to prevent overstimulation of the heart.
Question 12
If a manufacturer produces a cartridge containing 1.8 mL of solution, how much total volume is
administered if you give two full cartridges?
A) 1.8 mL
B) 2.0 mL
C) 3.6 mL
D) 4.0 mL
E) 5.4 mL
Correct Answer: C) 3.4-3.6
Rationale: Calculated as
1.8 mL × 2 = 3.6 mL
. Some modern cartridges are labeled as 1.7 mL, resulting in 3.4 mL for two cartridges.
Question 13
Which injection technique is most likely to require the use of a long (32mm) needle?
A) Mental nerve block
B) PSA nerve block
C) Inferior Alveolar (IA) nerve block
D) Supraperiosteal infiltration
| VERIFIED | UPDATED (ACTUAL EXAM)
Question 1
A patient requires treatment for a periodontal abscess on the lingual aspect of tooth #15. You
have already administered a Posterior Superior Alveolar (PSA) nerve block. Which additional
injection is required to anesthetize the lingual tissues?
A) Nasopalatine nerve block
B) Greater Palatine nerve block
C) Lesser Palatine nerve block
D) Middle Superior Alveolar nerve block
E) Local infiltration at the mucobuccal fold
Correct Answer: B) Greater Palatine
Rationale: The PSA nerve block anesthetizes the buccal periodontium and pulps of the
maxillary molars (except the mesiobuccal root of the 1st molar). To anesthetize the
palatal/lingual gingiva of the maxillary molars, the Greater Palatine nerve block is
necessary as it covers the hard palate and overlying soft tissues from the third molar to the
first premolar.
Question 2
You are performing subgingival scaling on the lingual surface of tooth #13. If you choose to use
a local infiltration for anesthesia, where should the needle be inserted?
A) At the mucobuccal fold
B) At the mucogingival junction
C) Into the free gingival margin
D) At the apex of tooth #13
E) Into the incisive papilla
Correct Answer: C) Free gingival margin
Rationale: For palatal infiltrations intended to provide localized anesthesia for scaling and
root planing (SRP), the injection is typically given in the attached gingiva or near the free
gingival margin of the specific tooth to affect the local nerve endings in that area.
Question 3
A patient presents with a deep periodontal defect on the lingual root surface of a maxillary
central incisor. Which injection is most appropriate to provide lingual anesthesia for this area?
A) Greater Palatine nerve block
B) Infraorbital nerve block
C) Nasopalatine nerve block
D) Mental nerve block
E) Long Buccal nerve block
Correct Answer: C) Nasopalatine
Rationale: The Nasopalatine nerve block provides anesthesia to the anterior portion of the
hard palate (soft and hard tissues) from the mesial of the right first premolar to the mesial
of the left first premolar.
, 2
Question 4
A patient develops a hematoma immediately following a Posterior Superior Alveolar (PSA)
nerve block. What is the recommended immediate treatment?
A) Heat packs for 24 hours
B) Cold packs and compression for 12 hours
C) Antibiotic prophylaxis
D) Incision and drainage
E) Immediate referral to an oral surgeon
Correct Answer: B) Cold and compression for 12 hours
Rationale: Immediate treatment for a hematoma involves applying pressure to the site of
bleeding and cold packs to promote vasoconstriction and minimize swelling. Heat should
only be applied after 24 hours to help dissipate the blood.
Question 5
A patient with a history of Cirrhosis of the liver requires Scaling and Root Planing (SRP). What
is the primary concern when administering an amide local anesthetic?
A) The patient is more likely to have a sulfa allergy
B) The drug will be excreted too quickly by the kidneys
C) The patient may have complications metabolizing the drug, increasing toxicity risk
D) Amides will cause a drop in blood pressure
E) There are no contraindications for amides in liver disease
Correct Answer: C) Patient has complications metabolizing the drug
Rationale: Amide local anesthetics (like Lidocaine and Mepivacaine) are primarily
metabolized in the liver. In a patient with Cirrhosis, hepatic function is compromised,
which can lead to a slower rate of metabolism, higher systemic blood levels of the
anesthetic, and an increased risk of toxicity.
Question 6
Which of the following statements best describes the ideal characteristics of a topical anesthetic?
A) It must be absorbed systemically to work
B) It works on keratinized tissue and is systemically toxic
C) It works on mucous membranes and is not systemically toxic
D) it must be injected into the basement membrane
E) It has a higher pH than the surrounding tissue
Correct Answer: C) #1. Works on mucous membranes. #2 not systemically toxic
Rationale: Topical anesthetics are designed to provide surface anesthesia to non-keratinized
mucous membranes. They should ideally have low systemic absorption to avoid toxicity
while effectively numbing the free nerve endings.
Question 7
In which of the following areas would a topical anesthetic be LEAST effective?
, 3
A) Buccal mucosa
B) Sublingual tissue
C) Keratinized/palatal tissue
D) Alveolar mucosa
E) Vestibular tissue
Correct Answer: C) Keratinized/palatal tissue
Rationale: Topical anesthetics do not penetrate highly keratinized tissue well. The hard
palate and attached gingiva are heavily keratinized, making the absorption of topical
agents significantly slower and less effective than on loose mucosa.
Question 8
What determines the "shelf-life" of a local anesthetic solution?
A) The date the box was opened
B) The color of the rubber stopper
C) The expiration date printed on the cartridge
D) The temperature of the room
E) The concentration of the vasoconstrictor
Correct Answer: C) Expiration date on cartridge
Rationale: The manufacturer guarantees the potency and sterility of the solution until the
expiration date listed on the glass carpule, provided it has been stored correctly.
Question 9
What is the clinical expectation if 1 mL of local anesthetic solution is administered over the
course of one minute?
A) The patient will experience a toxic reaction
B) No problems; this is a safe and slow rate of delivery
C) The patient will experience significant discomfort
D) The needle is likely to break
E) The heart rate will double
Correct Answer: A) No problems
Rationale: The recommended safe rate of deposition for local anesthesia is approximately 1
mL per minute. Rapid injection (e.g., a full cartridge in 30 seconds) increases the risk of
pain and systemic toxicity.
Question 10
Why does local anesthesia often fail to provide adequate numbing when injected into an area of
active infection or an abscess?
A) The bacteria eat the anesthetic molecules
B) The increased blood flow washes the drug away instantly
C) The infected area is more acidic (lower pH), which prevents the drug from ionizing into its
lipid-soluble form
, 4
D) The patient’s nerves are dead in infected areas
E) Vasoconstrictors do not work in the presence of pus
Correct Answer: C) The infected area is more acidic which does not allow ionization of
sodium molecules
Rationale: Local anesthetics are weak bases. In the low pH (acidic) environment of an
infection, the equilibrium shifts, and fewer molecules are available in the uncharged, lipid-
soluble form needed to cross the nerve membrane and block sodium channels.
Question 11
What is the maximum recommended dose of epinephrine for a healthy adult patient and a patient
with significant cardiovascular disease?
A) 0.5 mg (Healthy) / 0.1 mg (Cardiac)
B) 0.2 mg (Healthy) / 0.04 mg (Cardiac)
C) 1.0 mg (Healthy) / 0.5 mg (Cardiac)
D) 0.04 mg (Healthy) / 0.2 mg (Cardiac)
E) 0.01 mg (Healthy) / 0.00 mg (Cardiac)
Correct Answer: B) 0.2 mm for healthy / 0.04 mm for cardiac pt
Rationale: Healthy patients can tolerate up to 0.2 mg of epinephrine (approx. 11 cartridges
of 1:100k). Cardiac patients are limited to the "cardiac dose" of 0.04 mg (approx. 2
cartridges of 1:100k) to prevent overstimulation of the heart.
Question 12
If a manufacturer produces a cartridge containing 1.8 mL of solution, how much total volume is
administered if you give two full cartridges?
A) 1.8 mL
B) 2.0 mL
C) 3.6 mL
D) 4.0 mL
E) 5.4 mL
Correct Answer: C) 3.4-3.6
Rationale: Calculated as
1.8 mL × 2 = 3.6 mL
. Some modern cartridges are labeled as 1.7 mL, resulting in 3.4 mL for two cartridges.
Question 13
Which injection technique is most likely to require the use of a long (32mm) needle?
A) Mental nerve block
B) PSA nerve block
C) Inferior Alveolar (IA) nerve block
D) Supraperiosteal infiltration
